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Volumn 246, Issue 1, 2007, Pages 215-222

Heck coupling in zeolitic microcapsular reactor: A test for encaged quasi-homogeneous catalysis

Author keywords

Catalysis; Heck coupling; Leaching; Palladium; Recycle; Zeolitic microcapsular reactor

Indexed keywords

CATALYSIS; CATALYSTS; ENCAPSULATION; LEACHING; PALLADIUM; REACTION KINETICS; ZEOLITES;

EID: 33846213874     PISSN: 00219517     EISSN: 10902694     Source Type: Journal    
DOI: 10.1016/j.jcat.2006.11.028     Document Type: Article
Times cited : (95)

References (60)
  • 48
    • 33846203486 scopus 로고    scopus 로고
    • TM 40 catalyst (0.4 mmol Pd/g, purchased from Aldrich) under the same reaction condition as those described in the text with the catalyst amount corresponding to Pd in catalyst/aryl iodide = 0.0025. The catalyst showed high initial activity of 84% of iodobenzene conversion in 3 h but the conversion decreased to less than 20% after seven-time-recycle of the reaction and even to near zero after ten runs of the reaction. TEM characterization revealed that the fresh catalyst displayed the intact polymer matrix while some holes and cracks appeared on polyurea matrix of the ten-time-used catalyst. Based on these phenomena, the possible deactivation of the ten-time-recycled catalyst might be explained by the partial dissolution of the polymer matrix in the polar solvent (NMP) which further leads to the Pd leaching from the catalyst
  • 60
    • 33846217090 scopus 로고    scopus 로고
    • In this case (as shown in Scheme 1), the whole catalytic cycle would be halted in the stage of Pd(II) complex because no olefin existed in the reaction system at this stage to complete the whole catalytic cycle


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.